Very hard to say especially seeing as we haven't seen much of the game at all.
After the Masterchief collection I'm predicting this wion't come close to Halo 3 let alone 4.What might work in its favour is the xbox presumably being comparably front loaded this gen. If 2015/16 equal X1s peak, Halo should benefit a lot! Compare it to Halo 3 (last gen finally getting to its feet) and Halo 4 (Last gen coming to a close), the opportune time is right in between. Something which I think helped out Reach a lot despite it not being considered a main entry.







